Revert "bears wander, but through walls, so currently disabled"

This reverts commit f7812a2904b5bdf2e68f7e36268cd6a9e4cd5688.
Revert "death to magic numbers"

This reverts commit f5f3c0512a3a2f9d91155b24b15254f15d81cb5e.
Revert "bears have circular range now"

This reverts commit 8c8d331e7b4b488bf4e389dfd0367d2a5223bc22.
Revert "bears now like easy terrain"

This reverts commit 32c925f648111db18a6a70c1a131bc9d601b8e44.